Cone gyratory crusher



Inventors Anatoly Alexandrovich Levishko Ulitsa Pobedy 45 Kv. 18 Gennady Alexandrovich Kaljunov, Ulitsa Festivalnaya 23 kv. 4, Sverdlousk, U.S.S.R. Appl. No. 712,504 Filed Mar. 12, 1968 Patented Dec. 29, 1970 CONE GYRATORY CRUSHER 4 Claims, 2 Drawing Figs.

U.S. Cl 241/215, 74/86 Int. Cl 1102c 2/04 Field of Search 241/215, 214, 216, 213, 208, 212(CurS0 'y); 74/86 References Cited UNITED STATES PATENTS 302,566 7/1884 Huntington 241/215X 1,780 459 11/1930 Bernhard 24l/215X 2.6401351 6/1953 Gruender 241/215 FOREIGN PATENTS 397,781 6/1924 Germany 241/215 Primary Examiner- Robert C. Riordon Assistant Examiner-Donald G. Kelly Attorney-Waters, Roditi & Schwartz ABSTRACT: A crushing cone eccentric drive of a gyratory crusher has an eccentric sleeve with an eccentric opening therein for a shaft of a crushing cone. The eccentric sleeve is rotatably mounted with a running fit in a bushing and the sleeve has a surface on the thin side thereof of oblate shape extending over an arc of 180-240", the oblate portion gradually merging with a remaining cylindrical surface of the sleeve. The oblate surface is symmetrical relative to a plane extending at an angle of 3060 relative to the plane of eccentricity of the eccentric sleeve and offset in the direction of rotation of the sleeve.

PATENTEU DEE29 lsm CONE GYRATORY CRUSHER The present invention relates to cone gyratory crushers with an eccentric drive for the crushing cone and, more specifically, to those drives in which the eccentric sleeve is mounted in a bushing, wltrein it rotates with a running fit.

Heretofore, extensive use has been made of cone gyratorycrushers with an eccentric drive of the crushing cone, in which the external diameter of the eccentric sleeve is less than the internal diameter of the bushing wherein it rotates by an amount of 4'5 mm, to provide large a large radial clearance for abundant supply of oil for lubrication and cooling of the eccentric unit parts (e.g. Simons-type crushers made by Nordberg Co.

Yet, the presence of a large radial clearance between the eccentric sleeve and the surrounding bushing adversely affects the service life of the bushings and the bevel gear drive, crushing cone shaft and the eccentric sleeve proper.

As a result of the great difference in the diameters of the ec-' centric sleeve and the surrounding bushing, thereof the contact thereof in the process of the crusher operation is effected along a line defining sliding surfaces which gives rise to high linear pressures, wear and premature failure of the framework bushing and the eccentric sleeve.

With the large radial clearance and the. contact with the bushing along a line, the eccentric sleeve does not provide stability when it is affected by the crushing cone sleeve. instability of the eccentric shaft in the bushing is also enhanced by the fact that the linear contact of the crushing cone shaft shank and the linear contact of the eccentric sleeve with the bushing occur in different planes. As is known,'the resultant of the crushing forces is directed at a particular angle (-30") relative to the plane of the eccentrics eccentricity.

With such radial misalignment of the contact lines of the crushing cone sleeve in the eccentric shaft bushing and the eccentric sleeve in the framework bushing, in the process of crushing, rotation of the eccentric takes place with further cocking and tipping, which leads to disturbance of linear contact of the shaft shank with the eccentric sleeve bushing and disturbance of theplane contact in the thrust bearing of the eccentric sleeve, as a result of which high edge pressures and wear occur which cause premature failu're of parts of the eccentric unit. a

Moreover, when the eccentric sleeve rotates in the framework bushing with a large radial clearance, both the crushing cone shaft shank and the counterweight press the eccentric sleeve to one side and the sleeve does not rotate in the bushing but slides, the horizontal plane runout being inherent in this sliding to the value of a double radial clearance.

Hence, the bevel pinion mounted on the eccentric has the runout as well, whose value corresponds to the double radial clearance. This disturbs contact of the bevel gear pinion of the eccentric sleeve with the bevel pinion of the drive shaft, causing early failure of both of them.

Also known in the art are crushers for coarse and fine crushing (e.g. those made by Allis-Chalmers) in which the eccentric sleeve is mounted in the bushing with a running fit. in such designs, for effecting the passage of lubricant as well as for ensuring freedom of movement of the eccentric sleeve in the plane of eccentricity, the cylindrical surface of the eccentric is provided with various types of slots, passages in the fonn form of flats, surfaces of different diameteretc arranged on the thin (inoperative) side of the cylindrical surface of the eccentric, the passages being place along the axis of eccentricity or symmetrically about the latter at an arc of not more than 60".

Such crushers do not provide for proper retention of the lubricant between the sliding surfaces of the eccentric sleeve and the bushing in which the sleeve rotates additionally, jamming of the eccentric sleeve occurs in the bushing when the crusher starts to run idle after the crushing.

An object of the invention is to provide a crusher free from the disadvantages of the prior art designs.

Essentially, the invention aims at providing such a shape of the eccentric sleeve which ill ensure rotation thereof without sudden impact tilting and ja ming.

This objective is achieved in a crusher .with the eccentric sleeve having a running fit in the bushing, by an arrangement wherein the eccentric sleeve is of an oblate shape over an. arc of l-240 at the thin side thereof, whereas the oblate portion merges with a remaining cylindrical surface of the eccentric sleeve and is symmetrical relative to. a plane passing at a certain angle to to the plane of eccentricity and is angularly offset in the direction of rotation of the eccentric sleeve.

It is most expedient that the plane of symmetry of the surface with the oblate portion of the eccentric sleeve is angularly offset from the plane of eccentricity by an angle of 30 to 60.

A specific embodiment of the invention will now be described in detail, reference being had to the accompanying drawing, wherein:

FIG. 1 is a longitudinal section of the crusher eccentric unit; and 1 FIG. 2 is a cross-sectional view taken on line [1-]! in FIG, 1.

The crusher comprises a framework 1 (FIG. 1) with a sleeve I 2 centrally disposed therein, said sleeve housing a bushing 3.

Mounted in the bushing 3 is an eccentric sleeve 4, a bevel pinion 5 being press fitted in the upper end of sleeve 4. The bevel pinion 5 engages a bevel pinion 6 of a drive shaft 7.

Inside the eccentric sleeve 4 there is an eccentric opening with a bushing 8 disposed therein a shank 9 of the shaft of a crushing cone 10 being inserted into said bushing with a clearance. a

From below, in the framework bushing, the eccentric unit is supported by a thrust bearing 11.

in cross section, the eccentric sleeve 4 has the shape of a one-sided convex oval. At the thick side, the outerv surface of eccentric sleeve 4 is formed by a part of the cylindrical surface 12- (FIG. 2) through an arc of 15 whose diameter corresponds to the internal nominal diameter of the bushing 3. At the thin side the eccentric sleeve has an outer surface of somewhat oblate shape. This portion is formedby a one-sided convex curvilinear surface 13 smoothly merging with the surface l2 and forming a clearance 14 with the internal surface of the bushing 3 through an arc of 210, whereas both surfaces 12 and 13 are symmetrical relative a plane 15 of the eccentric sleeve passing at an angle of 45 to the plane of eccentricity l6 and the maximum value of the clearance takes place along the plane 15. g I a The maximum value of the clearance between the eccentric sleeve 4 and the internal surface of the bushing 3 is 6mm. The surface 12 corresponds to the operative surface of the eccentric sleeve and the surface 13 to the inoperative one.

Such a shape of the eccentric sleeve ensures its rotation in the bushing without sudden dynamic impacts and tilting since, when rotating, the eccentric sleeve, under the effect of the shank of the crushing cone shaft, will travel within the limits of its contact zone with the cylindrical bushing along the running fit, and may also smoothly roll (turn) within the limits of its clearance with the cylindrical bushing in the direction of the plane 15.

When rotating in the direction indicated by the arrow A, the eccentric sleeve 4 (FIG. 2) will contact the bushing 3 along the surface through an, arc corresponding to 150. As this takes place, the eccentric sleeve 4 will be pressed in this section against the wall of the bushing 3 by the shank 9 of the crushing cone 10. Therefore, the movement of the shank 9 in the bushing 8 under the effect of the crushing dynamic forces does-not cause the displacement and cocking of the eccentric sleeve 4 in the bushing 3.

Rotation of the eccentric sleeve 4 in the bushing 3, without displacements and cockings, ensures constant contact the teeth of the bevel pinions 5 and 6 and constant contact with the sliding surfaces of the thrust bearingl 1.

Due to the aforesaid shape of the eccentric sleeve and disposition of the plane 15 at an angle of 45 relative to the eccentricity 16 in the direction of its rotation in the crusher, stabilization of contact of the surfaces of gear engagement and uniformity of the distribution of specific pressure are ensured and, at the same time, the adverse effect ofthe radial coincidencc of maximum clearances between the shank 9 and bushing 8, and the eccentric sleeve 4 and the bushing 3 is precluded.

We claim: 1 In a cone gyratory crusher: an eccentric drive for a crushing cone including a rotatable eccentric sleeve having an eccentric opening therein for receiving a shaft of a crushing cone and defining a plane of eccentricity therewith, said eccentric sleeve having a thin side and a thick side formed by said eccentric opening, said eccentric sleeve having an oblate outer surface on the thin side thereof extending over an arc of about l240and a remaining cylindrical surface merging with the oblate surface, said oblate surface having a plane of symmetry offset at a predetermined angle with respect to said plane of eccentricity in the direction of rotation of said sleev' 2. A drive as claimed in claim 1 wh er ein 'said predetermined angle is 30 to 60.

bushing in said eccentric opening; aid eccentric sleeve. 

